HistoryThe following is taken from New York in the War of the Rebellion, 3rd ed.
Frederick Phisterer. Albany: J. B. Lyon Company, 1912.

Mustered in: November 23, 1861.
Mustered out: June 23, 1865.

Captain Terrence J. Kennedy received, October 18, 1861, authority to recruit
this battery. It was recruited and organized at Auburn, and there mustered in
the service of the United States for three years, November 23, 1861. At the
expiration of its term of service, the men entitled thereto were discharged
and the battery continued in service.

It left the State December 4, 1861; received its numerical designation December
7, 1861; served near Washington, D. C, from December, 1861; in W. F. Smith's
Division, Army of the Potomac, from January, 1862; in same division, 4th Corps,
Army of the Potomac, from March, 1862; in the 2d Division, 6th Corps, Army of
the Potomac, from May, 1862; in the Artillery Brigade, 6th Corps, from May,
1863; with the Army of the Shenandoah from October, 1864; in the 22d Corps from
December, 1864; in. the 6th Corps, with the Army of the Potomac, from January
25, 1865.

Commanded by Capt. Andrew Cowan, it was honorably discharged and mustered
out June 23, 1865, at Syracuse, having lost by death, killed in action, 1 officer,
12 enlisted men; of wounds received in action, 1 officer, 6 enlisted men; of
disease and other causes, 38 enlisted men; total, 2 officers, 56 enlisted men;
aggregate, 58; of whom 1 enlisted man died in the hands of the enemy.

The reunion of Cowan's battery on the battlefield of
Gettysburg, July 3rd, 1886. The twenty-third anniversary of the battle,
with a sketch of
the Battery, from 1861 to 1865. 1886.
Cover title: The First New York
Independent Battery of Light Artillery, Artillery Brigade, Sixth Corps, Army
of the Potomac, 1861 to 1865.

Murray, R. L.
"Hurrah for the ould flag!" : the true story of Captain Andrew
Cowan and the First New York Independent Battery at Gettysburg. Wolcott, N.Y.
: Benedum Books, 1998.